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1872. After finding a strange signalling device on the moon, the Doctor and Peri travel to the depths of the English countryside to track down the source of its transmissions. But they're not the first aliens to arrive on the scene.

Old enemies of the Doctor are drawing their battle lines in the forest and the local humans will be lucky to escape the conflagration unscathed.

For hidden within this village is a deadly secret - a secret that could destroy the entire Sontaran race... and reveal the terrible mystery of their creation.

The Kaveetch were natives of Sontar. Thousands of years earlier, after the war with the Rutan Host had reached a stalemate, Meredith Roath proposed the creation of a clone army, namely the Sontarans. Within weeks, the clones were not only fighting on the front lines but had turned the tide of the war firmly in the Kaveetch's favour. However, the Sontarans turned on their creators due to their supposedly inferior nature and unique knowledge of Sontaran physiology. The surviving Kaveetch, who numbered only in the hundreds, employed their rudimentary time travel and arrived in various locations throughout Mutter's Spiral in the early 1860s.